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Powell提出的热比较器法具有测试时间短、不破坏被测材料的优点.在Powell热比较器的基础上,参考Goldsmid比较器,我们设计了一种适宜测试各种建筑材料、塑料等低导热材料导热系数的热比较仪. 该仪器的测量本体是一个特殊的探头(见图1).探头的主要测试元件是两对铜—镰铜热电偶.温差热电偶A用以测定热端与探头触点之间的温差,温差热电偶B用来测定
Powell’s thermal comparator method has the advantages of short test time and no damage to the tested materials.On the basis of the Powell thermal comparator, with reference to the Goldsmid comparator, we designed a low thermal conductivity suitable for testing various building materials, plastics, etc. Material thermal conductivity of the thermal comparator. The instrument’s measurement of the body is a special probe (see Figure 1). The main test components of the probe are two pairs of copper - sickle copper thermocouple thermocouple A for the determination of the hot end and the probe Temperature difference between contacts, temperature difference thermocouple B is used to determine